Hi,
On Sun, 24 Apr 2016, Sergey Korshunoff wrote:
As I see this today. For example, I prefer to speed up tccboot kernel
compilation.
A current command to compile is like
tcc -o vmlinux linux/kernel/init.c linux/arch/kernel/head.c ...
With -cheaders[=dDIR] option tcc will precompile headers in each *.c
before the first C token is seen and create files
[DIR]linux/kernel/init.tch, [DIR]linux/arch/kernel/head.tch,... or
use these files if they already present. I think this is better and
don't need a special tuning.
This cmdline interface seems sensible. I must warn you, though, that
precompiled headers aren't totally trivial to get right. Depending on for
you go with precompilation. If you save the tokens before
macro-expansion is the easiest. If you save them after expansion you have
to take care of including headers in different environments. E.g. in these
two files:
% cat a.c
#define FOO
#include "header.h"
% cat b.c
#define BAR
#include "header.h"
the include file header.h might expand to a different token sequence
depening on if FOO or BAR are defined. Such define can also be hidden in
headers included before header.h. If you go even further and don't just
store token sequences but code snippets the complications will only
increase. Just something to keep in mind in the implementation.
Ciao,
Michael.
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